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Full text of "Monthly performance report : Montecito Pines"

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SOLAR/1045-79/04 



Monthly 

Performance 

Report 



MONTECITO PINES 
APRIL 1979 






FEB 14 1980 ■ 



U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 
MONTECITO PINES 
APRIL 1979 

I . SY STEM DESCRIPTION 

The Montecito Pines site is an apartment complex in Santa Rosa, California. 
It consists of one instrumented unit containing eight apartments. Each 
apartment has approximately 864 square feet of conditioned space. Solar 
energy is used for space heating and preheating domestic hot water (DHW). The 
solar energy system which serves the eight-apartment unit has an array of flat- 
plate collectors with a gross area of 950 square feet. The array faces 22 
degrees west of south at an angle of 45 degrees to the horizontal. Water is 
the transfer medium that delivers solar energy from the collector array to 
storage and to the space heating and hot water loads. Freeze protection is 
provided by drain down. Solar energy is stored underground in a 2000-gallon 
insulated tank. City water is circulated through a heat exchanger in the 
storage tank for preheating before entering a gas-fired boiler which supplies 
DHW on demand. When solar energy is insufficient to satisfy the space heating 
load, the gas-fired boiler provides auxiliary energy for space heating. The 
system, shown schematically in Figure 1, has four modes of solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when the collector plate 
temperature exceeds the storage temperature by 17°F and terminates when a 
temperature difference of 3°F is reached. Collector loop pump PI is operating. 

Mode 2 - Storage-to-Space Heating : This mode activates when there is a space 
heating demand and the temperature at the top of the storage tank is 105°F or 
higher. Space heating pump P2 is operating and mode diversion valves VI and 
V2 divert the flow to the heat exchanger in the storage tank and bypass the 
gas- fired boiler. 

Mode 3 - Auxiliary Space Heating, DHW Preheating : This mode activates when 
there is a space heating demand and the temperature at the top of the storage 
tank is less than 105°F. Space heating pump P2 is operating and mode diversion 
valves VI and V2 direct the flow through the gas-fired boiler and bypass the 
heat exchanger in the storage tank. 

Mode 4 - DHW Preheating : This mode activates when there is a demand for DHW. 
Incoming city water passes through the heat exchanger in the storage tank on 
the way to the gas-fired boiler which supplies hot water, on demand, to the 

apartments. 

II. PERFORMANCE EVALUATION 

INTRODUCTION 

The site was occupied in April and the solar energy system operated contin- 
uously during the month. Solar energy satisfied 59 percent of the DHW require- 
ments and 33 percent of the space heating requirements. The solar energy 



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system provided a fossil fuel energy savings of 17.4 million Btu at an expense 
of 0.67 million Btu of electrical energy. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
48.5 million Btu for a daily average of 1703 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during April of 1827 Btu per square foot for a plane facing 22 degrees west of 
south with a tilt of 45 degrees to the horizontal. The average ambient tem- 
perature during April was 53°F as compared with the long-term average for 
April of 56°F. The number of heating degree-days for the month (based on a 
65°F reference) was 360, as compared with the long-term average of 279. 



THERMAL PERFORMANCE 

System - During April the solar energy system performed somewhat poorer than 
expected. The expected performance was determined from a modified f-chart 
analysis using measured weather and subsystem loads as inputs. Solar energy 
collected was 13.4 million Btu versus an estimated 15.8 million Btu. Solar 
energy used by the system was estimated by assuming that all energy collected 
would be applied to the load. Actual solar energy used was 10.4 million Btu. 
System total solar fraction was 41 percent versus an estimated 50 percent. 

Collector - The total incident solar radiation on the collector array for the 
month of April was 48.5 million Btu. During the period the collector loop was 
operating, the total insolation amounted to 43.1 million Btu. The total 
collected solar energy for the month of April was 13.4 million Btu, resulting 
in a collector array efficiency of 28 percent, based on total incident insola- 
tion. Solar energy delivered from the collector array to storage was 11.5 
million Btu. Energy loss during transfer from the collector array to storage 
was 1.8 million Btu. This loss represented 14 percent of the energy collected. 
Operating energy required by the collector loop was 0.66 million Btu. 

Storage - Solar energy delivered to storage was 11.5 million Btu. There were 
11.5 million Btu delivered from storage to the DHW and space heating subsystems 
Energy loss from storage was 0.08 million Btu. This loss represented 1 percent 
of the energy delivered to storage. The storage efficiency was 99 percent: 
This is calculated as the ratio of the sum of the energy removed from storage 
and the change in stored energy, to the energy delivered to storage. The 
average storage temperature for the month was 108°F. 

DHW Load - The DHW subsystem consumed 4.6 million Btu of solar energy and 6.2 
million Btu of auxiliary thermal energy (equivalent to 7.7 million Btu of 
auxiliary fossil fuel energy) to satisfy a hot water load of 7.8 million Btu. 
The solar fraction of this load was 59 percent. Losses from the DHW subsystem 
were 3.0 million Btu. The DHW subsystem consumed a total of 0.70 million Btu 
of operating energy. A daily average of 451 gallons of DHW was consumed at an 
average temperature of 135°F delivered from the tank. 



Space H eating Load - The space heating subsystem consumed 5.8 million Btu of 
solar energy and 15.2 million Btu of auxiliary thermal energy (equivalent to 
19.0 million Btu of auxiliary fossil fuel energy) to satisfy a space heating 
load of 17.8 million Btu. The solar fraction of this load was 33 percent. 
Losses from the space heating subsystem were 3.3 million Btu. The space 
heating subsystem consumed a total of 2.1 million Btu of operating energy. 

OBSERVATIONS 

The extremely low storage loss during April is the result of an exceptional 
time-phase match between the collection and use of solar energy at this site. 
Solar energy was collected and delivered to storage during 29 out of 30 days 
in April; and solar energy was used for space heating for the same time period 
during 25 days. The system design is such that incoming city water is pre- 
heated at the same time that hot water is used. There was little time lag 
between the collection of solar energy and its application to the DHW and 
space heating loads; consequently, storage losses were minimal. 

ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 17.4 

million Btu at an expense of 0.67 million Btu of electrical energy. The DHW 

subsystem provided a fossil fuel energy savings of 7.7 million Btu. The 

space heating subsystem contributed a fossil fuel energy savings of 9.7 million 
Btu. 



III. ACTION STATUS 

Correction of the identified sensor anomalies has not been scheduled 






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